CN101968250B - Energy-saving optimized control system and method for refrigerator room - Google Patents

Abstract

The invention relates to an energy-saving optimized control system and an energy-saving optimized control method for a refrigerator room. The energy-saving optimized control system comprises an industrial control computer, a flow sensor, a temperature sensor, an outdoor temperature and humidity sensor, a three-phase active power transmitter, a water pump frequency converter and a cooling tower fan frequency converter which are connected with a programmable logic controller respectively, wherein the programmable logic controller communicates with the industrial control computer through an industrial Ethernet; and an RS485 communication interface module is connected with a water cooling unit and communicates with the industrial control computer through a ModBus protocol. A mathematical model of relationships between the energy consumption and running parameters of each equipment in the refrigerator room is established to regulate the running state of each equipment in combination with real-time refrigeration loads and weather parameters, thereby fulfilling the aim of making the lowest running energy consumption of the whole refrigerator room at the premise of meeting the refrigeration loads.

Description

A kind of refrigerator room energy saving optimizing control system and method

Technical field:

The present invention relates to a kind of energy conserving system and method, particularly the refrigerator room system.

Background technology:

In whole building energy consumption, the energy consumption of air-conditioning system is occupied very big ratio, generally about 40-50%.And in the energy consumption of air-conditioning system, refrigerator room equipment (comprising handpiece Water Chilling Units, chilled water pump, cooling water pump and cooling tower) accounts for 60-70%.One is adopted in the electric office building that freezes, and cold source of air conditioning (refrigerator room)-handpiece Water Chilling Units, annual electricity consumption freezing and cooling water pump and cooling tower account for the 30-35% of the annual electricity consumption of whole building.

Refrigerating operaton process in the air-conditioning system is: handpiece Water Chilling Units prepares the chilled water of uniform temperature; Be transported to end-equipment through chilled water pump, carry out heat exchange, the heat in the absorption chamber with room air; Remove redundant moisture in the room air simultaneously, to satisfy the requirement of indoor environment.Temperature raises behind the heat in the chilled water absorption chamber, again through recycling after the handpiece Water Chilling Units cooling.The heat that handpiece Water Chilling Units produces when work (is mainly the heat of chilled water from indoor absorption; The heat that own loss is produced when also comprising handpiece Water Chilling Units work) then absorbs by recirculated cooling water; Be transported to cooling tower and outdoor air through cooling water pump and carry out heat, wet exchange, finally distribute in atmospheric environment.

Therefore; How to save the refrigerator room energy consumption substantially the energy consumption that reduces monolithic architecture is had great important; In the prior art, what have can adopt lower chilled water supply water temperature and less chilled-water flow, and this moment, the energy consumption of handpiece Water Chilling Units was higher; But the energy consumption of chilled water pump is lower, perhaps adopts higher chilled water supply water temperature and bigger chilled-water flow.Equally, for the requirement of exerting oneself of identical handpiece Water Chilling Units, can select to make it to be operated under the lower condensing pressure, this moment, the energy consumption of handpiece Water Chilling Units was lower, but because lower condensing pressure needs higher cooling water flow, thereby the energy consumption of cooling water pump is higher; Perhaps opposite, adopt the handpiece Water Chilling Units energy consumption higher and working method that the cooling water pump energy consumption is lower does not have.Therefore, do not have a power-economizing method of relatively optimizing.

In the prior art; Some method is perhaps feasible under stable laboratory condition; But in actual moving process, because all devices in the refrigerator room all is in continuous running status, cooling load and weather parameters also can change at any time; This parameter actual value that will cause gathering acquisition has not regulation; Can't the equipment operating condition of refrigerator room be optimized through said method, even possibly produce a contrary effect, it is unpractical therefore in actual motion, seeking the highest operating point of whole freezing calculator room equipment operational efficiency through said method.In addition, in the prior art, do not set up the cooling tower heat exchange models simultaneously, this will inevitably reduce the effect of its energy consumption control.

Summary of the invention:

In order to overcome the deficiency of prior art, the invention provides a kind of refrigerator room energy saving optimizing control system and method, can improve device greatly the air-conditioning system refrigerator room has been optimized energy-conservation control effect, save the refrigerator room energy consumption substantially.

Control system according to a kind of refrigerator room energy saving optimizing provided by the invention, comprise industrial control computer, Programmable Logic Controller; The RS485 communication interface module, flow sensor, temperature sensor; The outdoor temperature humidity sensor, three phases active power transmitter, differential pressure pick-up; The pump variable frequency device, cooling tower fan frequency converter, motor-driven valve and switching value actuator, handpiece Water Chilling Units; Wherein: flow sensor, temperature sensor, outdoor temperature humidity sensor, three phases active power transmitter, pump variable frequency device and cooling tower fan frequency converter are connected with Programmable Logic Controller respectively; Programmable Logic Controller is through EPA and industrial control computer communication, and the RS485 communication interface module is connected with handpiece Water Chilling Units through ModBu agreement and industrial control computer communication; Described temperature sensor is respectively applied for the monitoring chilled water and supplies the return water temperature; Cooling water supplies the return water temperature; The outdoor temperature humidity sensor is used to monitor outdoor air dry-bulb temperature and relative humidity; Discharge when flow sensor is used to monitor water pump operation, the three phases active power transmitter is used to monitor the operation energy consumption of handpiece Water Chilling Units, water pump and cooling tower, and it is poor that differential pressure pickup is used to monitor the terminal temperature difference side pressure; Described Programmable Logic Controller and described RS485 communication interface module are used for gathering in real time the data of described sensor and transmitter acquisition; Described industrial computer is used to preserve described data and handles, and minimum with whole freezing machine room energy consumption is object function, determines each equipment of refrigerator room in next optimization energy-saving run operating mode constantly; And give Programmable Logic Controller (2) and RS485 communication interface module (3) with result transmission, send the operation control instruction.

Control system according to refrigerator room energy saving optimizing provided by the invention, also have following attached technical characterictic:

The outdoor temperature humidity sensor is arranged near the outdoor cooling tower air inlet; Chilled water supplies to be separately installed with temperature sensor on the return main; Cooling water supplies the return main to go up mounting temperature sensor respectively; On chilled water water supply or the return main flow sensor is installed; Cooling water or return main go up flow sensor are installed; Chilled water supplies between the return main differential pressure pick-up to be installed, and is separately installed with motor-driven valve and switching value actuator on the evaporator of every handpiece Water Chilling Units and condenser inlet, every cooling tower feed pipe and the return pipe, and every handpiece Water Chilling Units, every chilled water pump, every cooling water pump and every cooling tower are separately installed with the three phases active power transmitter.

The data of described Programmable Logic Controller collection comprise the data that flow sensor, temperature sensor, outdoor temperature humidity sensor, three phases active power transmitter and differential pressure pick-up are obtained; Described Programmable Logic Controller sends to industrial control computer with above-mentioned data, and the time interval that described industrial control computer is set is preserved described data one by one.Wherein, The supply and return water temperature of cooling water is detected by temperature sensor; Be sent to industrial computer through Programmable Logic Controller, in addition, handpiece Water Chilling Units itself also has the sensor of one group of cooling water supply and return water temperature; Its data directly are sent to industrial computer through the RS485 interface, and the supply and return water temperature of chilled water is identical therewith.

Said RS485 communication interface module carries out data acquisition to chilled water supply and return water temperature, cooling water supply and return water temperature, condensation temperature, condensing pressure, evaporating temperature, the evaporating pressure parameter of handpiece Water Chilling Units at least; With ModBus agreement and industrial control computer communication and transmit the data message of described handpiece Water Chilling Units; And, promptly preserve data by group by certain time interval by time sequence preservation.

Described Programmable Logic Controller and RS485 communication interface module will be optimized the adjuster that operating condition is transferred to corresponding device, make each equipment optimize operation under the operating condition.

The present invention also provides a kind of refrigerator room energy-conserving and optimizing control method, comprises the steps:

The first step is set up Mathematical Modeling, according to the series actual measurement operational factor of each equipment of refrigerator room, in conjunction with the operational factor of dispatching from the factory of each equipment, sets up the operational factor of each equipment and the Mathematical Modeling between the energy consumption, sets up correction program simultaneously;

Second step; Real time data sampling; Obtain in the handpiece Water Chilling Units parameter of condensation temperature, condensing pressure, evaporating temperature, evaporating pressure at least; Obtain the power of outdoor dry-bulb temperature, outside relative humidity, chilled water supply water temperature, chilled water return water temperature, cooling water temperature, cooling water return water temperature, chilled-water flow, cooling water flow, handpiece Water Chilling Units, the power of chilled water pump, the power of cooling water pump and the power of cooling tower simultaneously, and preserve these data one by one according to certain time interval;

The 3rd step, proofread and correct Mathematical Modeling, based on measured real-time running data of second step, call correction program, the Mathematical Modeling in the first step is carried out online in real time proofread and correct; The energy consumption of each equipment is calculated through Mathematical Modeling based on its operational factor in the system; Result of calculation is used for the energy consumption prediction and optimizes operation; But owing to possibly have certain deviation between Mathematical Modeling and the physical device; In order to improve prediction accuracy, need in running, carry out the real-time online correction to result of calculation and even Mathematical Modeling itself based on the data of actual measurement;

The 4th step; Computation optimization; Energy consumption sum with each equipment is that minimum is that target is optimized calculating; Obtain the optimal operating condition of each equipment of refrigerator room; Simultaneously handpiece Water Chilling Units is carried out surge Forecast; When handpiece Water Chilling Units is about to face surge and threatens, in advance handpiece Water Chilling Units is carried out surge protection by the operating point that changes handpiece Water Chilling Units, threaten in surge and eliminate the back and recover original operating point automatically;

The 5th step, feedback, the optimal operating condition that the 4th step was obtained is transferred to each equipment, and each equipment moves the whole freezing machine room by the operation of the operating mode in the Optimization result under the energy consumption of minimum;

In the 6th step, by certain time interval, repeated for the 3rd step, the 4th step and the 5th step.

The method of refrigerator room energy saving optimizing control provided by the invention also has following attached technical characterictic:

Because main equipment has handpiece Water Chilling Units, chilled water pump, cooling water pump and cooling tower in the refrigerator room; Therefore these four kinds of capital equipments are set up energy consumption model; The described Mathematical Modeling of the first step is handpiece Water Chilling Units energy consumption model, chilled water pump energy consumption model, cooling water pump energy consumption model and cooling tower energy consumption model, and described Mathematical Modeling is following:

$P_{\mathrm{chiller}}=\underset{i=1}{\overset{n_{\mathrm{Chiller}}}{\mathrm{\Σ}}}\frac{Q_{\mathrm{nom},i}}{{\mathrm{COP}}_{\mathrm{nom},i}}\·{\mathrm{PLR}}_{\mathrm{adj},i}\·{\mathrm{TEMP}}_{\mathrm{adj},i}$

${\mathrm{PLR}}_{\mathrm{adj}}=a_0+a_1\left(\frac{Q_{\mathrm{chiller}}}{Q_{\mathrm{nom}}}\right)+a_2{\left(\frac{Q_{\mathrm{chiller}}}{Q_{\mathrm{nom}}}\right)}^2$

${\mathrm{TEMP}}_{\mathrm{adj}}=b_0+b_1{T}_{\mathrm{CHWS}}+b_2{T}_{\mathrm{CHWS}}^2+b_3{T}_{\mathrm{CWS}}+b_4{T}_{\mathrm{CWS}}^2+b_5{T}_{\mathrm{CHWS}}\·T_{\mathrm{CWS}}$

$P_{\mathrm{pump}}=\frac{{{\mathrm{kQ}}_w}^3+H_{\mathrm{st},w}{Q}_w}{{\mathrm{\η}}_p{\mathrm{\η}}_c{\mathrm{\η}}_m}+P_{\mathrm{VFD}}$

$P_{\mathrm{CHWpump}}=\underset{j=0}{\overset{n_{\mathrm{CHWpump}}}{\mathrm{\Σ}}}\underset{J=0}{\overset{3}{\mathrm{\Σ}}}{c}_{J,j}{Q}_{w\_\mathrm{CHWpump}}^J$

$P_{\mathrm{CWpump}}=\underset{k=0}{\overset{n_{\mathrm{CWpump}}}{\mathrm{\Σ}}}\underset{K=0}{\overset{3}{\mathrm{\Σ}}}{d}_{K,k}{Q}_{w\_\mathrm{CWpump}}^K$

$P_{\mathrm{CTfan}}=\underset{l=0}{\overset{n_{\mathrm{CTfan}}}{\mathrm{\Σ}}}\underset{L=0}{\overset{3}{\mathrm{\Σ}}}{e}_{L,l}{Q}_{\mathrm{air}\_\mathrm{CTfan}}^L$

$Q_{\mathrm{rej}}=\frac{x_1{m}_w^{x_3}}{1+x_2{\left(\frac{m_w}{m_a}\right)}^{x_3}}(T_{\mathrm{CWS}}-T_{\mathrm{wb},i})$

In described the 4th step, optimized calculation method is:

P _{chiller_plant}＝Min(P _chiller+P _CHWpump+P _CWpump+P _CTfan)

Wherein:

P _Chiller: handpiece Water Chilling Units energy consumption, kW;

n _Chiller: handpiece Water Chilling Units operation platform number;

Q _Nom: handpiece Water Chilling Units name cold, kW;

COP _Nom: handpiece Water Chilling Units name COP;

PLR _Adj: handpiece Water Chilling Units sub-load regulatory factor;

TEMP _Adj: the handpiece Water Chilling Units adjustment factor;

a ₀, a ₁, a ₂: handpiece Water Chilling Units sub-load regulatory factor coefficient;

Q _Chiller: the actual cold of handpiece Water Chilling Units, kW;

b ₀, b ₁, b ₂, b ₃, b ₄, b ₅: handpiece Water Chilling Units adjustment factor coefficient;

T _CHWS: the chilled water supply water temperature, ℃;

P _Pump: pump energy consumption, kW;

H _St.w: open system static pressure, mH ₂O;

K: the coefficient relevant with pipeline characteristic curve;

Q _w: discharge, kg/s;

η _p: pump efficiency;

η _c: transmission efficiency;

η _m: electric efficiency;

P _VFD: frequency converter energy consumption, kW;

P _CHWpump: chilled water pump energy consumption, kW;

n _CHWpump: chilled water pump operation platform number;

c _{J, j}: the chilled water pump coefficient;

Q _{W_CHWpump}: chilled water pump flow, kg/s;

P _CWpump: cooling water pump energy consumption, kW;

d _{K, k}: the cooling water pump coefficient;

Q _{W_CWpump}: cooling water pump flow, kg/s;

n _CWpump: cooling water pump operation platform number;

P _CTfan: cooling tower energy consumption, kW;

n _CTfan: cooling tower operation platform number;

e _{L, l}: the cooling tower coefficient;

Q _{Air_CTfan}: cooling tower air quantity, kg/s; Wherein, as far as single speed and double speed cooling tower, wind

Amount can be known from producer's sample, for the variation embodiment of frequency conversion cooling tower air quantity

In the variation of blower fan of cooling tower frequency;

Q _Rej: cooling tower rate of heat dissipation, kW;

m _w: cooling water flow, kg/s;

m _a: air mass flow, kg/s; Wherein, as far as single speed and double speed cooling tower, air quantity

Can know from producer's sample, present for the variant of frequency conversion cooling tower air quantity

In the variation of blower fan of cooling tower frequency;

T _CWS: the cooling water temperature, ℃;

T _{Wb, i}: air dry-bulb temperature, ℃;

The time interval of real time data sampling the shortlyest is set at 2 minutes in second step.So that can gather more data, in time find the system exception fault.

In the 6th step, the time interval of repetition is that minimum of a value is 10 minutes.In general chilled water system; After chilled water is confessed flow through water pump and terminal heat exchange from handpiece Water Chilling Units; Getting back to handpiece Water Chilling Units once more needs the regular hour, can better reflect this process in 10 minutes, can not embody this whole process if blanking time is too short and can't know load condition more accurately; Move if overlong time can cause system to be in for a long time under the unoptimizable operating mode, cause energy dissipation.

The present invention has considered influencing each other in the running of each equipment in the refrigerator room comprehensively; With the whole freezing machine room is whole; Consider the optimal operating condition of each equipment comprehensively, seek the best of breed of each equipment in the refrigerator room, realize that refrigerator room runs on higher state; Thereby the whole system energy consumption is minimum, realizes purpose of energy saving.

Description of drawings:

Fig. 1 is the structural representation of apparatus of the present invention embodiment.

Fig. 2 is the inventive method embodiment flow chart.

The specific embodiment:

Like Fig. 1, shown in Figure 2, apparatus of the present invention embodiment comprises: industrial control computer 1, Programmable Logic Controller 2, RS485 communication interface module 3; Flow sensor 4, temperature sensor 5, outdoor temperature humidity sensor 6; Three phases active power transmitter 7, differential pressure pick-up 8, pump variable frequency device 9; Cooling tower fan frequency converter 10, motor-driven valve and switching value actuator 11, handpiece Water Chilling Units 12.

According to the present invention; Several flow sensors 4, plurality of temperature sensor 5 can be set, outdoor temperature humidity sensor 6, several three phases active power transmitters 7, differential pressure pick-up 8, several pump variable frequency devices 9 are connected with Programmable Logic Controller 2 respectively with several cooling tower fan frequency converters 10; Programmable Logic Controller 2 is through EPA and industrial control computer 1 communication, and RS485 communication interface module 3 is connected with unit through ModBus agreement and industrial control computer 1 communication.Outdoor temperature humidity sensor 6 places near the outdoor cooling tower air inlet; Chilled water supplies on the return main temperature sensor 5 to be installed respectively; Cooling water supplies on the return main temperature sensor 5 to be installed respectively; Chilled water supplies water or the return main goes up flow sensor 4 of installation; Cooling water or return main go up a flow sensor 4 are installed; Chilled water supplies to install between the return main differential pressure pick-up 8, on every handpiece Water Chilling Units evaporator and condenser inlet, every cooling tower feed pipe and the return pipe motor-driven valve and switching value actuator 11 is installed respectively, and every handpiece Water Chilling Units, every chilled water pump, every cooling water pump and every cooling tower are installed a three phases active power transmitter 7 respectively.

Described temperature sensor 5 is respectively applied for monitoring chilled water supply water temperature; The chilled water return water temperature, cooling water temperature, cooling water return water temperature; Outdoor temperature humidity sensor 6 is used to monitor outdoor air dry-bulb temperature and relative humidity; Discharge when flow sensor 4 is used to monitor water pump operation, three phases active power transmitter 7 is used to monitor the operation energy consumption of handpiece Water Chilling Units, water pump and cooling tower, and it is poor that differential pressure pickup 8 is used to monitor the terminal temperature difference side pressure; Programmable Logic Controller 2 flow sensor 4, temperature sensor 5, outdoor temperature humidity sensor 6, three phases active power transmitter 7 and differential pressure pick-up 8 carry out data acquisition and send to industrial control computer 1, and preserve one by one by certain time interval; Parameters such as the chilled water supply and return water temperature of 3 pairs of handpiece Water Chilling Units of RS485 communication interface module, cooling water supply and return water temperature, condensation temperature, condensing pressure, evaporating temperature, evaporating pressure are carried out data acquisition; Transmit these data messages of handpiece Water Chilling Units with ModBus agreement and industrial control computer 1 communication to it, and preserve by the time sequence; 1 pair of Programmable Logic Controller of industrial control computer 2 is handled with the data message that RS485 communication interface module 3 collects; Minimum with whole freezing machine room energy consumption be object function; Determine each equipment of refrigerator room in next optimization energy-saving run operating mode constantly, and give Programmable Logic Controller 2 and RS485 communication interface module 3 result transmission; Programmable Logic Controller 2 will be optimized the adjuster that operating condition is transferred to corresponding device with RS485 communication interface module 3, satisfy under the prerequisite of cooling load, make each equipment energy-saving safety operating under the situation of whole freezing machine room total energy consumption minimum.

As shown in Figure 2, the inventive method implementing procedure specifies as follows:

At first; Series actual measurement operational factor according to each equipment of refrigerator room; In conjunction with the operational factor of dispatching from the factory of each equipment, set up the operational factor of each equipment and the Mathematical Modeling between the energy consumption, set up correction program simultaneously; In the present embodiment, the Mathematical Modeling of foundation is handpiece Water Chilling Units energy consumption model, chilled water pump energy consumption model, cooling water pump energy consumption model and cooling tower energy consumption model;

Secondly; Industrial control computer obtains parameters such as the condensation temperature, condensing pressure, evaporating temperature, evaporating pressure of handpiece Water Chilling Units through the RS485 communication interface module; Obtain outdoor dry-bulb temperature, relative humidity, chilled water supply water temperature, chilled water return water temperature, cooling water temperature, cooling water return water temperature, chilled-water flow, cooling water flow, the power of handpiece Water Chilling Units, the power of chilled water pump, the power of cooling water pump and the power of cooling tower that sensor transmits through Programmable Logic Controller, preserve these data one by one according to certain time interval; The time interval can be set to 2 minutes;

Next, after industrial control computer obtains the real-time running data of each equipment through RS485 communication interface module and Programmable Logic Controller, call the model tuning program and the energy consumption model of each equipment in the refrigerator room is carried out online in real time proofread and correct;

Then; Industrial control computer is according to the real-time cooling load and the meteorologic parameter of monitoring; Energy consumption model according to the handpiece Water Chilling Units of having proofreaied and correct, chilled water pump, cooling water pump and cooling tower; Most effective as target with the whole freezing machine room, each minimum of a value that is about to handpiece Water Chilling Units energy consumption model, chilled water pump energy consumption model, cooling water pump energy consumption model and cooling tower energy consumption model is optimized the optimal operating condition that calculates each equipment of refrigerator room as target; Simultaneously handpiece Water Chilling Units is carried out surge Forecast; When handpiece Water Chilling Units is about to face surge and threatens, in advance handpiece Water Chilling Units is carried out surge protection through the operating point that changes handpiece Water Chilling Units, threaten in surge and eliminate the back and recover original operating point automatically;

At last; Industrial control computer is transferred to handpiece Water Chilling Units and Programmable Logic Controller through the optimal operating condition that RS485 communication interface module and EPA obtain computation optimization; Each equipment makes whole freezing machine room energy-saving run under the energy consumption of minimum by the operation of the operating mode in the Optimization result;

In the present embodiment, the energy-conservation condition calculating model description of the optimization in the industrial control computer 1 is following:

P _{chiller_plant}＝Min(P _chiller+P _CHWpump+P _CWpump+P _CTfan) (1)

$P_{\mathrm{chiller}}=\underset{i=1}{\overset{n_{\mathrm{Chiller}}}{\mathrm{\Σ}}}\frac{Q_{\mathrm{nom},i}}{{\mathrm{COP}}_{\mathrm{nom},i}}\·{\mathrm{PLR}}_{\mathrm{adj},i}\·{\mathrm{TEMP}}_{\mathrm{adj},i}---\left(2\right)$

${\mathrm{PLR}}_{\mathrm{adj}}=a_0+a_1\left(\frac{Q_{\mathrm{chiller}}}{Q_{\mathrm{nom}}}\right)+a_2{\left(\frac{Q_{\mathrm{chiller}}}{Q_{\mathrm{nom}}}\right)}^2---\left(3\right)$

${\mathrm{TEMP}}_{\mathrm{adj}}=b_0+b_1{T}_{\mathrm{CHWS}}+b_2{T}_{\mathrm{CHWS}}^2+b_3{T}_{\mathrm{CWS}}+b_4{T}_{\mathrm{CWS}}^2+b_5{T}_{\mathrm{CHWS}}\·T_{\mathrm{CWS}}---\left(4\right)$

$P_{\mathrm{pump}}=\frac{{{\mathrm{kQ}}_w}^3+H_{\mathrm{st},w}{Q}_w}{{\mathrm{\η}}_p{\mathrm{\η}}_c{\mathrm{\η}}_m}+P_{\mathrm{VFD}}---\left(5\right)$

$P_{\mathrm{CHWpump}}=\underset{j=0}{\overset{n_{\mathrm{CHWpump}}}{\mathrm{\Σ}}}\underset{J=0}{\overset{3}{\mathrm{\Σ}}}{c}_{J,j}{Q}_{w\_\mathrm{CHWpump}}^J---\left(6\right)$

$P_{\mathrm{CWpump}}=\underset{k=0}{\overset{n_{\mathrm{CWpump}}}{\mathrm{\Σ}}}\underset{K=0}{\overset{3}{\mathrm{\Σ}}}{d}_{K,k}{Q}_{w\_\mathrm{CWpump}}^K---\left(7\right)$

$P_{\mathrm{CTfan}}=\underset{l=0}{\overset{n_{\mathrm{CTfan}}}{\mathrm{\Σ}}}\underset{L=0}{\overset{3}{\mathrm{\Σ}}}{e}_{L,l}{Q}_{\mathrm{air}\_\mathrm{CTfan}}^L---\left(8\right)$

$Q_{\mathrm{rej}}=\frac{x_1{m}_w^{x_3}}{1+x_2{\left(\frac{m_w}{m_a}\right)}^{x_3}}(T_{\mathrm{CWS}}-T_{\mathrm{wb},i})---\left(9\right)$

Wherein:

P _Chiller: handpiece Water Chilling Units energy consumption, kW;

n _Chiller: handpiece Water Chilling Units operation platform number;

Q _Nom: handpiece Water Chilling Units name cold, kW;

COP _Nom: handpiece Water Chilling Units name COP;

PLR _Adj: handpiece Water Chilling Units sub-load regulatory factor;

TEMP _Adj: the handpiece Water Chilling Units adjustment factor;

a ₀, a ₁, a ₂: handpiece Water Chilling Units sub-load regulatory factor coefficient;

Q _Chiller: the actual cold of handpiece Water Chilling Units, kW;

b ₀, b ₁, b ₂, b ₃, b ₄, b ₅: handpiece Water Chilling Units adjustment factor coefficient;

T _CHWS: the chilled water supply water temperature, ℃; Handpiece Water Chilling Units adjustment factor coefficient

P _Pump: pump energy consumption, kW;

H _St.w: open system static pressure, mH ₂O;

K: the coefficient relevant with pipeline characteristic curve;

Q _w: discharge, kg/s;

η _p: pump efficiency;

η _c: transmission efficiency;

η _m: electric efficiency;

P _VFD: frequency converter energy consumption, kW;

P _CHWpump: chilled water pump energy consumption, kW;

n _CHWpump: chilled water pump operation platform number;

c _{J, j}: the chilled water pump coefficient;

Q _{W_CHWpump}: chilled water pump flow, kg/s;

P _CWpump: cooling water pump energy consumption, kW;

d _{K, k}: the cooling water pump coefficient;

Q _{W_CWpump}: cooling water pump flow, kg/s;

n _CWpump: cooling water pump operation platform number;

P _CTfan: cooling tower energy consumption, kW;

n _CTfan: cooling tower operation platform number;

e _{L, l}: the cooling tower coefficient;

Q _{Air_CTfan}: cooling tower air quantity, kg/s;

Q _Rej: cooling tower rate of heat dissipation, kW;

m _w: cooling water flow, kg/s;

m _a: air mass flow, kg/s;

T _CWS: the cooling water temperature, ℃;

T _{Wb, i}: air ' s wet bulb temperature, ℃;

Formula (1) is most effective as object function with the whole freezing machine room; Formula (2) is the efficiency model of handpiece Water Chilling Units; Formula (3) is the sub-load regulatory factor in the handpiece Water Chilling Units efficiency model, and formula (4) is the adjustment factor in the handpiece Water Chilling Units efficiency model, the coefficient a in the formula ₀, a ₁, a ₂, b ₀, b ₁, b ₂, b ₃, b ₄, b ₅Combine the sample data regression fit of producer to obtain according to the handpiece Water Chilling Units operation characteristic, formula (5), (6), (7) are the efficiency models of water pump, the coefficient c in the formula _{J, j}, d _{K, k}The a series of operation flows of water pump and the corresponding energy consumption that obtain according to actual measurement, and combine water pump producer respective sample are returned by nonlinear multivariable and obtain, and formula (8) is the efficiency model of cooling tower, the coefficient e in the formula _{L, 1}The a series of operation air quantity of cooling tower fan and the corresponding energy consumption that obtain according to actual measurement; And combination cooling tower producer respective sample; Obtain by the nonlinear multivariable recurrence; Formula (9) is the relation between the wet-bulb temperature of cooling tower rate of heat dissipation and air quantity, the water yield, coolant water temperature and air through cooling tower, coefficient x in the formula ₁, x ₂, x ₃Under a series of surrounding air wet and dry bulb temperature conditions, the corresponding relation of the heat of air quantity, cooling water flow, coolant water temperature and cooling tower through the cooling tower fan in conjunction with the respective sample data of cooling tower producer, is returned by nonlinear multivariable and to obtain.

After utilizing above-mentioned model to set up virtual system, just can find out the running status that refrigerator room is in peak efficiency through the global optimizing algorithm.The input of this global optimization approach comprises: real-time cooling load and meteorologic parameter.Should also be noted that the setting of part limit value simultaneously.At first every kind of equipment all has its maximum working capacity and operation platform number in the refrigerator room; Secondly each equipment in the refrigerator room all is connected with a kind of specific mode with other equipment, influences each other in the running, and for example handpiece Water Chilling Units, water pump and cooling tower must move simultaneously and can realize process of refrigerastion; In addition; Quality and energy balance also are the conditions that this global optimization approach must be considered; For example in system's running, the cooling water inflow of the cooling water pump of flowing through, cooling tower and condenser must equate that the heat dissipation capacity of cooling tower should be substantially equal to refrigeration duty and handpiece Water Chilling Units power sum.

Be optimized when calculating, algorithm should be monitored real-time cooling load and meteorologic parameter, with as initial conditions, the relevant limit condition of mentioning with preamble is as constraint, and is most effective as object function with the whole freezing machine room.Here adopt a kind of high efficiency method,, seek combination of optimized operation equipment and the combination of optimal device setting value according to the virtual system model of setting up.In case search out this optimum combination, they will be applied to actual refrigerator room, run on state efficiently to guarantee actual refrigerator room.

The a certain operating mode of pilot process is an example:

For example: certain time point, the real operating mode of certain refrigerator room is: cooling-water machine is organized a performance to count and is moved a handpiece Water Chilling Units, a chilled water pump, a cooling water pump, a cooling tower at present, handpiece Water Chilling Units name cold Q _{Nom, l}Be 7032kW, handpiece Water Chilling Units name COP _{Nom, l}Be 5.1.The actual cold Q of handpiece Water Chilling Units _ChillerBe 4922kW, 7 ℃ of chilled water supply water temperatures, 29 ℃ of cooling water temperature, handpiece Water Chilling Units sub-load regulatory factor coefficient a ₀=0.13547, a ₁=0.75320, a ₃=0.10684; Handpiece Water Chilling Units adjustment factor coefficient b ₀=0.68874, b ₁=-0.0043184, b ₂=0.0010723, b ₃=0.0014989, b ₄=0.0004789, b ₅=-0.0010965.The chilled water pump converting operation, chilled-water flow 235kg/s; The cooling water pump converting operation, cooling water flow 279kg/s; Chilled water pump coefficient c _0,1=38.001, c _1,1=0.17599, c _2,1=-0.00014970, c _3,1=2.6998 * 10 ^-7The cooling water pump coefficient d _0,1=0.014346, d _1,1=-0.00010675, d _2,1=0.0, d _3,1=0.0000015552; Cooling tower is the single speed cooling tower, and cooling tower fan power frequency operation is at 50Hz, and the cooling tower fan power is rated power 42kW.According to foundation Mathematical Modeling, draw:

${\mathrm{PLR}}_{\mathrm{adj}}=0.13547+0.75320\×\left(\frac{4922}{7032}\right)+0.10684\×{\left(\frac{4922}{7032}\right)}^2=0.715$

TEMP _adj＝0.68874-0.0043184×7+0.0010723×7×7+0.0014989×29

+0.0004789×29×29-0.0010965×7×29

＝0.935

$P_{\mathrm{chiller}}=\frac{7032}{5.1}\×0.715\×0.935=921\mathrm{kW}$

P _CHWpump＝38.001+0.17599×235-0.0001497×235×235

+2.6998×10 ^-7×235×235×235

＝74.6kW

P _CWpump＝0.014346-0.00010675×279

+0.0000015552×279×279×279

＝33.8kW

P _CTfan＝42kW

The total energy consumption of refrigerator room is under this operating condition:

P _{chiller_plant}＝921+74.6+33.8+42

＝1071.4kW

After obtaining the refrigerator room total energy consumption of this operating mode; System optimizing control is used identical method and is calculated under this real-time cooling load and the meteorologic parameter condition; Various device is finally confirmed an optimum operating condition at the refrigerator room total energy consumption of different operating conditions, and promptly its total energy consumption is the minimum of a value of the refrigerator room total energy consumption of all operating modes; Realize this optimum operating condition then, reach purpose of energy saving.

The foregoing description is explanation the present invention's a usefulness only, and is not to be limitation of the present invention, and the those of ordinary skill in relevant field on this basis, can also be made numerous variations and improvement project, and not break away from spirit of the present invention and protection domain.In these claims, hope to have comprised all these changes and the improvement project that meets essence of the present invention and scope.

Claims (9)

1. a refrigerator room energy saving optimizing control system is characterized in that: comprise industrial control computer (1), Programmable Logic Controller (2); RS485 communication interface module (3), flow sensor (4), temperature sensor (5); Outdoor temperature humidity sensor (6), three phases active power transmitter (7), differential pressure pick-up (8); Pump variable frequency device (9), cooling tower fan frequency converter (10), motor-driven valve and switching value actuator (11), handpiece Water Chilling Units (12); Wherein: flow sensor (4), temperature sensor (5), outdoor temperature humidity sensor (6), three phases active power transmitter (7), pump variable frequency device (9) and cooling tower fan frequency converter (10) are connected with Programmable Logic Controller (2) respectively; Programmable Logic Controller (2) is through EPA and industrial control computer (1) communication, and RS485 communication interface module (3) is connected with handpiece Water Chilling Units through ModBus agreement and industrial control computer (1) communication; Described temperature sensor (5) is respectively applied for monitoring chilled water supply and return water temperature; The cooling water supply and return water temperature; Outdoor temperature humidity sensor (6) is used to monitor outdoor air dry-bulb temperature and relative humidity; The discharge of flow sensor (4) when being used to monitor water pump operation, three phases active power transmitter (7) is used to monitor the operation energy consumption of handpiece Water Chilling Units, water pump and cooling tower, and it is poor that differential pressure pickup (8) is used to monitor the terminal temperature difference side pressure; Described Programmable Logic Controller (2) and described RS485 communication interface module (3) are used for gathering in real time the data of described sensor and transmitter acquisition; Described industrial computer (1) is used to preserve described data and handles, and minimum with whole freezing machine room energy consumption is object function, determines each equipment of refrigerator room in next optimization energy-saving run operating mode constantly; And give Programmable Logic Controller (2) and RS485 communication interface module (3) with result transmission, send the operation control instruction.

2. refrigerator room energy saving optimizing according to claim 1 is controlled system; It is characterized in that: outdoor temperature humidity sensor (6) is arranged near the outdoor cooling tower air inlet; Chilled water supplies to be separately installed with temperature sensor (5) on the return main; Cooling water supplies the return main to go up mounting temperature sensor (5) respectively; On chilled water water supply or the return main flow sensor (4) is installed, cooling water or return main go up flow sensor (4) are installed, and chilled water supplies between the return main differential pressure pick-up (8) to be installed; Be separately installed with motor-driven valve and switching value actuator (11) on the evaporator of every handpiece Water Chilling Units and condenser inlet, every cooling tower feed pipe and the return pipe, every handpiece Water Chilling Units, every chilled water pump, every cooling water pump and every cooling tower are separately installed with three phases active power transmitter (7).

3. refrigerator room energy saving optimizing according to claim 2 is controlled system, it is characterized in that:

The data that described Programmable Logic Controller (2) is gathered comprise the data that flow sensor (4), temperature sensor (5), outdoor temperature humidity sensor (6), three phases active power transmitter (7) and differential pressure pick-up (8) are obtained; Described Programmable Logic Controller (2) sends to industrial control computer (1) with above-mentioned data, and described industrial control computer (1) is preserved described data one by one by the time interval of setting.

4. refrigerator room energy saving optimizing according to claim 2 is controlled system, it is characterized in that:

Described RS485 communication interface module (3) carries out data acquisition to chilled water supply and return water temperature, cooling water supply and return water temperature, condensation temperature, condensing pressure, evaporating temperature, the evaporating pressure parameter of handpiece Water Chilling Units at least; With ModBus agreement and industrial control computer (1) communication and transmit the data message of described handpiece Water Chilling Units, and preserve by the time sequence.

5. control system according to any described refrigerator room energy saving optimizing among the claim 1-4; It is characterized in that: described Programmable Logic Controller (2) and RS485 communication interface module (3) will be optimized the adjuster that operating condition is transferred to corresponding device, make each equipment optimize operation under the operating condition.

6. a refrigerator room energy-conserving and optimizing control method is characterized in that: comprise the steps:

The first step is set up Mathematical Modeling, according to the series actual measurement operational factor of each equipment of refrigerator room, in conjunction with the operational factor of dispatching from the factory of each equipment, sets up the operational factor of each equipment and the Mathematical Modeling between the energy consumption, sets up correction program simultaneously;

Second step; Real time data sampling; Obtain in the handpiece Water Chilling Units parameter of condensation temperature, condensing pressure, evaporating temperature, evaporating pressure at least; Obtain the power of outdoor dry-bulb temperature, outside relative humidity, chilled water supply water temperature, chilled water return water temperature, cooling water temperature, cooling water return water temperature, chilled-water flow, cooling water flow, handpiece Water Chilling Units, the power of chilled water pump, the power of cooling water pump and the power of cooling tower simultaneously, and preserve these data one by one according to certain time interval;

The 3rd step, proofread and correct Mathematical Modeling, according to measured real-time running data of second step, call correction program, the Mathematical Modeling in the first step is carried out online in real time proofread and correct;

The 4th step; Computation optimization; Energy consumption sum with each equipment is that minimum is that target is optimized calculating; Obtain the optimal operating condition of each equipment of refrigerator room; Simultaneously handpiece Water Chilling Units is carried out surge Forecast; When handpiece Water Chilling Units is about to face surge and threatens, in advance handpiece Water Chilling Units is carried out surge protection by the operating point that changes handpiece Water Chilling Units, threaten in surge and eliminate the back and recover original operating point automatically;

The 5th step, feedback, the optimal operating condition that the 4th step was obtained is transferred to each equipment, and each equipment moves the whole freezing machine room by the operation of the operating mode in the Optimization result under the energy consumption of minimum;

The 6th the step, in certain time interval, repeat the 3rd the step, the 4th the step and the 5th step.

7. the method for refrigerator room energy saving optimizing control according to claim 6; It is characterized in that: the described Mathematical Modeling of the first step is handpiece Water Chilling Units energy consumption model, chilled water pump energy consumption model, cooling water pump energy consumption model and cooling tower energy consumption model, and described Mathematical Modeling is following:

$P_{\mathrm{chiller}}=\underset{i=1}{\overset{n_{\mathrm{Chiller}}}{\mathrm{\Σ}}}\frac{Q_{\mathrm{nom},i}}{{\mathrm{COP}}_{\mathrm{nom},i}}\·{\mathrm{PLR}}_{\mathrm{adj},i}\·{\mathrm{TEMP}}_{\mathrm{adj},i}$

${\mathrm{PLR}}_{\mathrm{adj}}=a_0+a_1\left(\frac{Q_{\mathrm{chiller}}}{Q_{\mathrm{nom}}}\right)+a_2{\left(\frac{Q_{\mathrm{chiller}}}{Q_{\mathrm{nom}}}\right)}^2$

${\mathrm{TEMP}}_{\mathrm{adj}}=b_0+b_1{T}_{\mathrm{CHWS}}+b_2{T}_{\mathrm{CHWS}}^2+b_3{T}_{\mathrm{CWS}}+b_4{T}_{\mathrm{CWS}}^2+b_5{T}_{\mathrm{CHWS}}\·T_{\mathrm{CWS}}$

$P_{\mathrm{pump}}=\frac{{{\mathrm{kQ}}_w}^3+H_{\mathrm{st},w}{Q}_w}{{\mathrm{\η}}_p{\mathrm{\η}}_c{\mathrm{\η}}_m}+P_{\mathrm{VFD}}$

$P_{\mathrm{CHWpump}}=\underset{j=0}{\overset{n_{\mathrm{CHWpump}}}{\mathrm{\Σ}}}\underset{J=0}{\overset{3}{\mathrm{\Σ}}}{c}_{J,j}{Q}_{w\_\mathrm{CHWpump}}^J$

$P_{\mathrm{CWpump}}=\underset{k=0}{\overset{n_{\mathrm{CWpump}}}{\mathrm{\Σ}}}\underset{K=0}{\overset{3}{\mathrm{\Σ}}}{d}_{K,k}{Q}_{w\_\mathrm{CWpump}}^K$

$P_{\mathrm{CTfan}}=\underset{l=0}{\overset{n_{\mathrm{CTfan}}}{\mathrm{\Σ}}}\underset{L=0}{\overset{3}{\mathrm{\Σ}}}{e}_{L,l}{Q}_{\mathrm{air}\_\mathrm{CTfan}}^L$

$Q_{\mathrm{rej}}=\frac{x_1{m}_w^{x_3}}{1+x_2{\left(\frac{m_w}{m_a}\right)}^{x_3}}(T_{\mathrm{CWS}}-T_{\mathrm{wb},i})$

In described the 4th step, optimized calculation method is:

P _{chiller_plant}＝Min(P _chiller+P _CHWpump+P _CWpump+P _CTfan)

Wherein:

P _Chiller: handpiece Water Chilling Units energy consumption, kW;

n _Chiller: handpiece Water Chilling Units operation platform number;

Q _Nom: handpiece Water Chilling Units name cold, kW;

COP _Nom: handpiece Water Chilling Units name COP;

PLR _Adj: handpiece Water Chilling Units sub-load regulatory factor;

TEMP _Adj: the handpiece Water Chilling Units adjustment factor;

a ₀, a ₁, a ₂: handpiece Water Chilling Units sub-load regulatory factor coefficient;

Q _Chiller: the actual cold of handpiece Water Chilling Units, kW;

b ₀, b ₁, b ₂, b ₃, b ₄, b ₅: handpiece Water Chilling Units adjustment factor coefficient;

T _CHWS: the chilled water supply water temperature, ℃;

P _Pump: pump energy consumption, kW;

H _St.w: open system static pressure, mH ₂O;

K: the coefficient relevant with pipeline characteristic curve;

Q _w: discharge, kg/s;

η _p: pump efficiency;

η _c: transmission efficiency;

η _m: electric efficiency;

P _VFD: frequency converter energy consumption, kW;

P _CHWpump: chilled water pump energy consumption, kW;

n _CHWpump: chilled water pump operation platform number;

c _J.j: the chilled water pump coefficient;

Q _{W_CHWpump}: chilled water pump flow, kg/s;

P _CWpump: cooling water pump energy consumption, kW;

d _{K, k}: the cooling water pump coefficient;

Q _{W_CWpump}: cooling water pump flow, kg/s;

n _CWpump: cooling water pump operation platform number;

P _CTfan: cooling tower energy consumption, kW;

n _CTfan: cooling tower operation platform number;

e _{L, l}: the cooling tower coefficient;

Q _{Air_CTfan}: cooling tower air quantity, kg/s;

Q _Rej: cooling tower rate of heat dissipation, kW;

m _w: cooling water flow, kg/s;

m _a: air mass flow, kg/s;

T _CWS: the cooling water temperature, ℃;

T _{Wb, i}: air ' s wet bulb temperature, ℃;

8. the method for refrigerator room energy saving optimizing according to claim 6 control is characterized in that: the time interval of real time data sampling the shortlyest is set at 2 minutes in second step.

9. the method for refrigerator room energy saving optimizing control according to claim 6, it is characterized in that: in the 6th step, the time interval minimum of a value of repetition is 10 minutes.

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